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Fair Value Measurements - Assets and Liabilities Measured at Fair Value under Certain Conditions (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity Securities without Readily Determinable Fair Value, Amount   $ 521   $ 524
Impairments requiring certain assets and liabilities to be measured at fair value      
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount    
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount    
VillageMD        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount $ 1,800